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Transmission mictrostrip line to coupled line ?

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mauloftin

mauloftin

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Hi,

can tell me somebody, how can I do transmission mictrostrip line to coupled line? Have you some theory? Exactly I need transmission mictrostrip line to differential line.

Thank!
 

Exactly, if I have SAW filter with balance input/output (differential impedance) - how can I use microstrip line as source?
 

is my question stupidity or is it so difficult ? :)

Or my english is so horrible? :)
 

Are you sure that your SAW filter requires differential input/output?
 

You need to use something called a "balun" at the input and at the output. You can make one from coupled lines (like a marchand balun), you can make one from lumped elements, and you can make one from a ferrite tranformer with wire windings.

The best performance would be a transmission line balun, but it will be long. I would probably go with a lumped element balun myself.

Added after 4 minutes:

such as in the following files:
 
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